Top spam generators: USA – 26%, Korea – 20%, China – 16%

US computers were responsible for about 26% of the global spam in April-September 2005, Sophos found. In 2004, 42% of the world?s spam originated on US machines. The share of spam originating in South Korea jumped from 12% to 20% over the past year. In China, it went from 9% to 16%.